196664393 has 2 divisors, whose sum is σ = 196664394. Its totient is φ = 196664392.

The previous prime is 196664353. The next prime is 196664411. The reversal of 196664393 is 393466691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158558464 + 38105929 = 12592^2 + 6173^2 .

It is a cyclic number.

It is not a de Polignac number, because 196664393 - 2⁸ = 196664137 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (196664333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98332196 + 98332197.

It is an arithmetic number, because the mean of its divisors is an integer number (98332197).

Almost surely, 2^196664393 is an apocalyptic number.

It is an amenable number.

196664393 is a deficient number, since it is larger than the sum of its proper divisors (1).

196664393 is an equidigital number, since it uses as much as digits as its factorization.

196664393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 47.

The square root of 196664393 is about 14023.7082471078. The cubic root of 196664393 is about 581.5341794880.

The spelling of 196664393 in words is "one hundred ninety-six million, six hundred sixty-four thousand, three hundred ninety-three".